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백형래,이상일 조선대학교 생산기술연구소 1986 生産技術硏究 Vol.8 No.1
The comparison about motor losses and efficiency is recently a significant item in the study of inverter control for AC drives. Motor losses are usually measured as the small difference between input and output power. Since almost of motor lossaslare converted to heat, temperature rise is happened in motor. Therefore we have studied to use steady state temperature rise as the measurement of the motor losses.
백형래,조금배,유권종 조선대학교 동력자원연구소 1993 動力資源硏究所誌 Vol.15 No.2
In the photovoltaic power system the maximum power control is necessary because output power of solar cell array is varied by solar insolation and temperature. The high frequency operation is essential for the development of the controller. However the e-i characteristics of Solar Cell Array have hysteresis in high frequency operation. It makes controller which is operated by conventional control method uncontrollable. Therefore, it is indispensable to develop a new control method to obtain maximum available power from solar cell array. The simulation result shows the effectiveness of controller using two-state value control method.
無停電 電源供給裝置를 위한 새로운 펄스폭 變調方式에 대한 硏究
백형래 조선대학교 동력자원연구소 1987 動力資源硏究所誌 Vol.9 No.2
The communication circuit inverter has been applied to make the uninterruptible power supply (UPS). Recently, The UPS use the power transistor, therefore, the characteristics are developed and it is smaller in the physical size. The UPS in many influenced by the harmonies. This paper presents that the efficiency was developed and the harmonies can be removed by using the control technique of the PWM modulation in the UPS.
백형래,박수강 조선대학교 에너지.자원신기술연구소 2000 에너지·자원신기술연구소 논문지 Vol.22 No.1
Single-Phase diode rectifiers are widely used in industry. These rectifier, however, generate many harmonic components in the AC Power line and have the poor input power factor, which may create a power quality problem for other electrical apparatus in the vicinity of the rectifier. Power factor improvement and harmonic reduction in the AC line current have become very significant problems in single-phase diode rectifiers. In this paper, the high power factor boost converter using soft switching is proposed t o improve the demerit. The simulation results show the validity of the proposed system.
白亨來,金亨坤 朝鮮大學校 動力資源硏究所 1981 動力資源硏究所誌 Vol.3 No.1
In this paper, the application of a three-phase 120 -gated forced comnnitated thyristor inverter as a regenerative rectification circuit is discussed. The circuit has the ability to accept or deliver DC current without change of nominal DC voltage magnitude or polarity and also has the capability to instantaneously change from motoring to generating and vice versa. An analysis of the circuit is undertaken to provide both the current waveforms and the regulation characteristics, which are compared with those of a conventional rectifier. Theoretical results are compared with those obtained from a laboratory working prototype.
전력용 트랜지스터를 이용한 비대칭 PWM 3상 교류초퍼에 관한 연구
白亨來 건국대학교 1990 論文集 Vol.30 No.1
A control technique of asymmetical PWM AC chopper is proposed which not only eliminates the harmonic current, but also improves the input power factor. The ideal switching function for the proposed technique is derived and converted into asymmetrical PWM pattern for practical implementation of AC chopper. Digital simulation is performed to investigate the theoretical characteristics of the proposed APWM technique. The asymmetrical PWM technique is compared to the symmetrical that at the three phase AC chopper.
백형래,박수강,최연옥,한엄용,이성길 조선대학교 에너지.자원신기술연구소 1999 에너지·자원신기술연구소 논문지 Vol.21 No.1
Single-Phase diode rectifiers are widely used in industry. These rectifier, however, generate many harmonic components in the AC Power line and have the poor input power factor, which may create a power quality problem for other electrical apparatus in the vicinity of the rectifier. Power factor improvement and harmonic reduction in the AC line current have become very significant problems in single-phase diode rectifiers. In this paper, the high power factor boost converter using soft switching is proposed to improve the demerit. The simulation results show the validity of the proposed system.
白亨來 조선대학교 동력자원연구소 1984 動力資源硏究所誌 Vol.6 No.1
Energy savings are possible in lightly loaded induction motors by means of controlling the applied voltage using SCRs which occupies about 80% of thyristor that has the peculiar characteristics in its simple operation, small size and inexpensiveness. In this paper tests are conducted on a fractional horse power motor, and several voltage control arrangements are compared to improve the motor efficiency and power factor.
백형래,김대곤 조선대학교 동력자원연구소 1997 動力資源硏究所誌 Vol.19 No.1
UPS is used to provide high quality power source on load from the power interruption,source interference and especially, UPS which has high efficiency to protect the device is demanded. In this paper, discrete control system is introduced to improve output waveforms of UPS. This technique can be obtained stable output by conversion of frequency control with phase synchronism of UPS output and utility power source and amplitude control to various load. And then,the compact and efficiency UPS can be realized by remove of the analog circuit and simulation and experimentation were performed with this control algorithm.
입력전력제어에 의한 단상유도전동기의 효율개선에 관한 연구
백형래,박수강 조선대학교 에너지.자원신기술연구소 2000 에너지·자원신기술연구소 논문지 Vol.22 No.1
The paper presents a new drive for single-phase induction motor and a one-chip micom-based controller and control method for self-starting and Input power saving of single-phase induction motor driven from a phase angle control is described. The controller is capable of motor operating in the maximum efficiency region as well as in the optimal input power region. The implementation of the microprocessor is based on an 8-bit programmable micro-controller in low cost. The proposed method is based on the optimal efficiency control which is running by variable phase angle of main winding current of single-phase induction motors. The variable phase angle switching strategy more economized for self-starting and phase angle control of the motor than the PWM switching strategy in high cost. The implemented system consists of TRIAC for voltage control, starting capacitor, 8bit one-chip microcontroller for maximum efficiency control. Experiments are focused on a capacitor starting single-phase induction motor, the optimal Input energy saving by variable phase angle control are verified by experimental results. Also, auxiliary winding was controlled by electronic starting switch.